Safety-valve and muffler.



N0.63|,37o. Patented Aug. 22, |899.

' J. HUGHES.

SAFETY VALVE AND MUFFLER,

(Application led Dec. 24, 1898.)

(No Model.)

WTNEaEE E15 UNITED STATES PATENT OFFICE.

JOHN HUGHES, OF SOMERVILLE, MASSACIIUSETTS, ASSIGNOR TO THE CROSBY STEAM GAGE AND VALVE COMPANY, OF BOSTON, MASSACHUSETTS.

SAFETY-VALVE AND MUFFLER.

SPECIFICATION forming part of Letters Patent No. 631,370, dated August 22, 1899.

Application filed December 24, 1898. Serial No. 700,228. (No model.)

T all whom t irtag/ concern:

Beit known' that I, JOHN HUGHES, a citizen of the United States, residing at Somerville, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Safety-Valves and Muiilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others 1o skilled in the art to which it appertains to make and luse the same. l

This invention relates to certain improvements in safety-valves and mufliers, and particularly upon the devices shown and described in a patent issued to George H. Crosby, No. 225,801, dated March 23, 1880.

In the annexed drawings, Figure l repre-k sents the muflied valve in elevation, having a quartersection removed and in section to 2o show one-half thereof, with all the parts assembled in true relation to each other. Fig.

2 is a transverse section on linexx of Fig. l.

Fig. 3 is a transverse section on yy of Fig. l.

Fig. 4: is a modilication of the upper part of Fig. l above y y, partly in section.

In the drawings, A is the base of the valve, of which a a are the two concentric seats, there being formed within the inner seat CL a a chamber a. Leading from this chamber a 3o are passages a2, all of which may be seen in Fig. 2. In the base A is a circular depression a3. Mounted on the base A is the valve proper, B, having its concentric seats coincident with the seats of the base A at a a.

b is the guide of the valve proper, B, ex-

tending downwardly into the chamber a.

(Shown in section in Fig. 2.) At b' the valve rises circumferentially about the lower part of the spring-case C and shuts out the steam from it.

C is the spring-case, attached by proper screw-threads to the base A at c. This case C extends upwardly to the top of the device and through the upper part are small perforations c' to permit any steam which may enter the spring-case to pass outwardly to the open air. (Seen in plan view, Fig. 3, shown through the line y y, Fig. l.) Vithin the springease C is the spring D, the lower end 5o of which rests upon a circular projection d3 of the spindle d?, the lower end dJ1 of. the latier bearing upon the valve proper, B. This spindle d2 extends upwardly through the valve, having on its upper end screw-threads, upon which is mounted the acorn-shaped nut dforming a bearing on the under side,against which a lever G impinges. At the upper end of the spring-case C is a hollow spring-bolt d, which extends down to the cap d6 to compress the spring when required and having upon it 6o the check-nut d to lock or hold it in place when the spring has been compressed. Attached to the spring-case C at e/ is the U- shaped mufiiing device E, having a series of perforations e e, dac. Q

F is the exterior of the case, corresponding to thecase Gin the Crosby patent, which surrounds the base A at and below the port CL2 and at f2 forms a sleeve or gate and is located Within the circular channel a3. At this point 7o it slides freely around and up and down the case and here performs the same function as the sleeve F does in the Crosby patent. It is formed in two parts, having its joint atf, which is a bolt for securing them together, the upper part extending above and over the mufiiing device E and is attached to the spring-case C by screw-threads at f3. It has in the upper part slots or openingsf, through which the steam escapes into the open air af- 8o ter having passed through the perforations e e, rbc., of the mufrling device E. At its union atf it forms a close circumferential contact with the mufiiing device E, thus compelling all steam which passes through the valveseats to go through the muftling device, but not so close as to prevent its rotation.

By rotating the case F on the spring-case C at f3 it rises and falls, so that the lower portion or sleevefz, which surrounds the base 9o A, will modify the area of the ports d2, and thus control the volume of the steam which `passes into the chamber a and outwardly through the ports a2. The case F has a checknut f4, which locks it in position whenever it has been operated for adjusting the openings of the ports a2. Mounted on top of the spring-ease C by the hexagonal nut gis a lever G, hinged to the nut at g. The upper part of lever G impinges on the under side of roo the acorn-shaped nut d5, as before described.

In this relation any force exerted upon the long arin of lever G will lift the spindle cl2, and thus by releasing` the valve proper, B, it will rise under pressure of the steam from the boiler.

Fig. is a modification of the mniiier at its top, having the lever removed and a slnallcap H screwed upon the upper' part of the spring-case O above the hexagonal nut f4 of case F.

Having described my invention, what l claim isl. The combination of a safety-valve provided with one or more steam-escape passages,

a2, the annular groove, a5, the valve-seats, CL d, and valve B; the adjustable annular' exterior oase, F, with its bottom edge, f2, to fit loosely in the groove, a3, the U-shaped muf- Witnesses:

JOSHUA H. MILLETT, ARTHUR L. Bowman. 

